Grain Refinement and Tensile Properties of 17.5Ni Maraging Steels with High Strength

Soeno, Kô; Tsuchiya, Masatoshi; Taguchi, Kazuo; Kuroda, Tetsurô

doi:10.2355/tetsutohagane1955.69.7_815

Tetsu-to-Hagane

1983

DOI: 10.2355/tetsutohagane1955.69.7_815

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Grain Refinement and Tensile Properties of 17.5Ni Maraging Steels with High Strength

Kô Soeno

Masatoshi Tsuchiya

Kazuo Taguchi

et al.

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1987

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“…When aged at relative low temperature, tensile properties of maraging steels that have larger amounts of alloy elements for higher strength come to be markedly dependent on the strain-rate(1)- (12) during test in air environment and tend to fail in a shorter period even at a low stress level when sustained load tests are performed in air environment.…”

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Delayed Failure and Precipitation Behavior in Maraging Steels

Asayama

1987

Trans. JIM

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The relationship between delayed failure occurring in air environment and precipitation behaviors was studied on maraging steels by sustained load test and electrical resistivity measurement.The formation of low temperature precipitates associated with the presence of titanium was found to have a close relation to the delayed failure occurring on cobalt free maraging steels containing titanium as a main hardening element. In case of 18% Ni maraging steels, the delayed failure in air environment was scarcely affected by the precipitation of Mo rich low temperature precipitates which played an important role in the hardening at low temperature aging, but the delayed failure began to be markedly revealed depending on the titanium content, when titanium was added in the 186/ Ni maraging steels. It was estimated from the activation energies that the delayed failure of 18% Ni maraging steels was also significantly affected by the formation of the low temperature precipitates relevant to titanium.Since it is assumed that the delayed failure is controlled by interaction between dislocation motion cutting the coherent precipitates and hydrogen introduced by dissociation of water adsorbed on the steel surface, the reason why the delayed failure does not occur by the formation of Mo low temperature precipitates only would be that Mo rich low temperature precipitates do not promote the dissociation of water adsorbed on the steel surface unlike the low temperature precipitates relevant to titanium.(Received December 20, 1986) -Keywords: cobalt free maraging steel, 18% nickel maraging steel, delayed failure, sustained load test, activation energy, electrical resistivity, effect of isothermal aging, effect of isochronal aging

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Delayed Failure and Precipitation Behavior in Maraging Steels

Asayama

1987

Trans. JIM

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Grain Refinement and Tensile Properties of 17.5Ni Maraging Steels with High Strength

Cited by 1 publication

References 2 publications

Delayed Failure and Precipitation Behavior in Maraging Steels

Delayed Failure and Precipitation Behavior in Maraging Steels

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